Chances are good most of you don’t all have the same riding style. Some of you probably ride for a physical challenge while others ride for a technical challenge. Some for both. Some of you have specialty bikes devoted to one specific type of riding, while others a quiver of one that’s as versatile as possible.
The point is, when Shimano set out to create the next version of XTR, they didn’t feel that one drivetrain system would fit all riders. Calling on their 22 years of experience in making things shift, Shimano has introduced a new XTR M9000 group to be as versatile and capable as the riders it’s built for.
Those looking for an answer to the 1x trend will happily find it with 9000. And those looking for one of the widest range triples in history will find it as well. Details after the break…
At the heart of Shimano’s M9000 and M9020 groups is the concept of rhythm and range. One can easily see that Shimano’s 1x system doesn’t have the spread of their competitor;s wide range cassette, but in typical Shimano fashion the M9000 is all about system engineering and producing the most efficient drivetrain possible. Everyone wants to know about the 1x option of the new XTR so we’ll start with the new HG-X11 11-40 cassette.
No, there are no 10t or 42t cogs, but one of the main benefits of the cassettes is that it fits on standard Shimano freehub bodies without any new parts. Where their 11-speed road groups required a slightly wider freehub body, Shimano was able to squeeze 11 mountain bike gears into the space of 10 without making the gears any narrower thanks to the larger low cogs. Unlike a road cassette, the big cogs can be dished around the spokes since they sit out farther, so the freehub body and the hub spacing remain the same.
Tooth counts are 11-13-15-17-19-21-24-27-31-35-40, skipping two, then three, then four and finally a five count. Shimano calls it Rhythm Step gearing, and the idea is that you are able to save energy by staying in control of cadence and effort because of the closer steps in gearing. With the new cassette a single shift is a cadence adjustment of about 10 rpm, a double shift is a 20 rpm change which represents a terrain change, and a triple shift is about a 30 rpm difference for a reactionary or emergency shift.
HG-X11 cassettes use a multi-spider structure with two clusters built on a carbon spider and two clusters with aluminum spiders. There are six titanium, one aluminum, and four steel cogs. Weight is claimed at 330g.
So why not offer the range of XX1 for the XTR 1x? With the improvements to XTR, Shimano feels that if you need more range than the 1x system you are better off with the new Trail 2x crank which offers drastically improved performance, especially from the front derailleur.
The Hollow Tech II crank uses a 1x specific Hollow Glide chainring with titanium teeth. Cranks will be offered in a 560g M9000-1 Race version and a 590g M9020-1 Trail version each with 30, 32, 34, and 36t chainring options. When Shimano set out to build a 1x crank it had to be longer wearing, and offer exceptional driving stiffness while still preventing chain drop.
An interesting design feature of all of the XTR cranks is the modular chainring construction which allows 1x, 2x, or 3x on the same crank. 1x cranks will be sold as crank arms only with chainrings sold separately, while the trail double will be sold as 38/28, 36/26, or 34/24. Doubles will be offered in the 158mm q-factor m9000 crank which weighs 620g, and the 168mm q-factor m9020 crank at 645g. Trail doubles use the Hollow Glide chainring technology for the driving gear (big ring) and an aluminum granny gear.
Think of the most frequent gears you go to on your cassette. Shimano calls these the Driving Range. The new 2x system is designed to get you out of “granny gear jail” meaning that once you shift down to the granny gear you aren’t stuck there for the rest of the climb. There will also be a compact triple offered in the 11 speed group with a 22-30-40t gearing. Combined with the 40t cassette, the 22t will offer the “lowest gear in history of mountain biking ever.” The m9020-3 will weigh in around 655g.